What effect does the quality of the alumina neutral ramming material have on the life of the induction furnace?

The quality of the lining refractory material and its performance play a fundamental role in the service life of the furnace.

(1) Refractory materials for furnace construction must have a high degree of refractoriness, resist high-temperature heat load, and do not soften or melt. At the same time, it must have high volume stability, resist high temperature heat load, and have no volume shrinkage and only uniform expansion.

(2) The composition of refractory materials. Impurities in refractory materials can form compounds with low melting points at high temperatures, thereby reducing the refractoriness of refractory materials. Therefore, the content of quartz in the furnace lining sand must be ensured, and the impurity composition must be strictly controlled. The composition of the furnace lining sand is controlled as follows: ω (SiO2) ≥ 98.0%; ω (Al2O3) ≤ 0.5%; ω (Fe2O3) ≤ 0.5%; ω (TiO2) ≤ 0.05%; ω (H2O) ≤ 0.5%.

(3) Granularity ratio of refractory materials. The reasonable particle size ratio of refractory materials can easily form a high-density refractory layer during the furnace building process, and defects are not easy to appear during the use process. The following is a set of reasonable ratios: 3.35mm～5mm, 0.85mm～1.70mm, 0.1mm～0.85mm, and the proportions below 0.1mm are 17%, 33%, 20%, and 30% respectively.